Use std:: on symbols declared in C++-style C headers.

src/cached-powers.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 134 matching lines @@
 const int PowersOfTenCache::kMaxDecimalExponent = 340;
 
 void PowersOfTenCache::GetCachedPowerForBinaryExponentRange(
     int min_exponent,
     int max_exponent,
     DiyFp* power,
     int* decimal_exponent) {
   int kQ = DiyFp::kSignificandSize;
   // Some platforms return incorrect sign on 0 result. We can ignore that here,
   // which means we can avoid depending on platform.h.
-  double k = ceil((min_exponent + kQ - 1) * kD_1_LOG2_10);
+  double k = std::ceil((min_exponent + kQ - 1) * kD_1_LOG2_10);
   int foo = kCachedPowersOffset;
   int index =
       (foo + static_cast<int>(k) - 1) / kDecimalExponentDistance + 1;
   ASSERT(0 <= index && index < kCachedPowersLength);
   CachedPower cached_power = kCachedPowers[index];
   ASSERT(min_exponent <= cached_power.binary_exponent);
   ASSERT(cached_power.binary_exponent <= max_exponent);
   *decimal_exponent = cached_power.decimal_exponent;
   *power = DiyFp(cached_power.significand, cached_power.binary_exponent);
 }
 
 
 void PowersOfTenCache::GetCachedPowerForDecimalExponent(int requested_exponent,
                                                         DiyFp* power,
                                                         int* found_exponent) {
   ASSERT(kMinDecimalExponent <= requested_exponent);
   ASSERT(requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance);
   int index =
       (requested_exponent + kCachedPowersOffset) / kDecimalExponentDistance;
   CachedPower cached_power = kCachedPowers[index];
   *power = DiyFp(cached_power.significand, cached_power.binary_exponent);
   *found_exponent = cached_power.decimal_exponent;
   ASSERT(*found_exponent <= requested_exponent);
   ASSERT(requested_exponent < *found_exponent + kDecimalExponentDistance);
 }
 
 } }  // namespace v8::internal